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General Philosophy

Well logs can be interpreted on a variety of levels, depending on the requirements of the user. These distinct levels can be classified as:

According to the requirements, the analyst may perform only a quick evaluation or consume hours of computer time in the analysis of the log data. Consciously or not, all analysts use some kind of physical model as a basis for analysis. It is worthwhile to reflect on these models before discussing the techniques of mathematical interpretation.

Suppose that a device existed that read porosity. Suppose further that this device could be made as small or as large as desired (Fig. 21.1). Now assume that it is 100 times smaller than a grain of sand. In a porous formation, this tiny tool will either find itself in a pore space and read 100% porosity, or it will find itself in a sand grain and read 0% porosity; that is, it has only two possible states. If the tool were placed at a large number of random points in the formation, a statistical distribution of 100 and 0% porosity readings would be developed that would provide a description of the porosity of the formation.

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